A low
sperm count would be defined as less than 20 million sperm per ml
of semen.

On average,
sperm count should be above 60 million/ml.

According
to the National Institutes of Health, a "good" sperm count
is characterized by several factors.

The amount
of sperm per volume of semen is very important for fertility. On average,
each ejaculation should produce 1.5 to 5.0 milliliters of semen.

The average
sperm count is 20 to 150 million per milliliter of semen.

The shape
and motility of the sperm can also affect male fertility. In order
for a sperm count to be considered normal, at least 60 percent of
the sperm should be normally shaped and able to swim forward.